JP2005304698A - Image display apparatus and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus and an image display method easily finding an actual dimension of an internal site of a subject. <P>SOLUTION: Because a radiograph is a magnified image of the actual subject, if a distance is measured from the obtained image, a value obtained is larger than the actual dimension. This image display apparatus, when measuring the length, displays a magnification ratio with the measurement value and allows the user to understand how much magnified it is from the actual dimension. This apparatus further displays imaging environment such as the positional relation and the attitude between a tube (an X-ray source) and a sensor for indicating how the image is photographed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display device and an image display method suitable for a medical image display device that displays an X-ray image.

  In the medical field, image diagnosis refers to observing and diagnosing a film image taken by X-ray on a Schaukasten. However, in recent years, X-ray imaging equipment using a solid-state imaging device or the like has been developed, and X-ray image digital reading and imaging using a computer has been performed.

  In such conventional X-ray imaging, X-rays generated from a tube (X-ray generator) pass through the subject and are projected onto a film or sensor, so that the X-ray image is larger than the actual size of the subject. Obtained as an image.

  Therefore, in the diagnosis using the film image, when measuring the length between two points on the film, the distance is measured by directly applying the ruler to the film to be measured. Here, in order to obtain the enlargement ratio, it must be manually calculated based on the distance between the cassette and the tube.

  On the other hand, when X-ray digital scanning is performed, diagnosis is performed by displaying the image on a monitor such as a CRT or a liquid crystal display. In this case, in order to measure the length between two points on the image, measurement is performed using a distance measurement tool or the like attached to the X-ray image display system (see Patent Document 1).

  However, since the value measured using the distance measurement tool is the distance on the sensor that receives the X-rays transmitted through the subject as described above, it is larger than the actual size, and the actual subject Dimensions cannot be obtained. Further, it is impossible to specify the position of the subject in the depth direction only by designating between the two points on the image, and therefore, it is not possible to obtain the distance between the two points having different depths.

JP 2000-132667 A

  It is an object of the present invention to provide an image display device and an image display method that can easily determine the actual dimensions of a part in a subject.

  As a result of intensive studies to solve the above problems, the present inventor has come up with various aspects of the invention described below.

  An image display device according to the present invention includes an image display unit that displays an image of a subject detected by a sensor on a screen, a measurement unit that measures a distance between any two points on the image, and the measurement unit. Measurement value display means for displaying the measured values measured, ratio calculation means for calculating the ratio of the actual dimension of the image detected by the sensor to the measured value, and the ratio calculated by the ratio calculation means A ratio display means for displaying the position, a positional relation setting means for setting the positional relation among the subject, the sensor and the radiation source when photographing the subject, and a positional relation set by the positional relation setting means. Photographing ratio display means for displaying a photographing environment, and the ratio calculating means calculates the ratio using the positional relationship set by the positional relationship setting means. And butterflies.

  An image display system according to the present invention includes a sensor, a radiation source that generates radiation toward the sensor, and the image display device.

  An image display method according to the present invention includes an image display step of displaying an image of a subject detected by a sensor on a screen, a measurement step of measuring a distance between any two points existing on the image, and the measurement step. Set in the measurement value display step for displaying the measured measurement value, the positional relationship setting step for setting the mutual positional relationship among the subject, the sensor and the radiation source when photographing the subject, and the positional relationship setting step A shooting environment display step for displaying a shooting environment including a positional relationship, and a ratio between the actual dimension of the image detected by the sensor and the measured value is calculated using the positional relationship set in the positional relationship setting step. And a ratio display step for displaying the ratio calculated in the ratio calculation step. It is characterized in.

  The program according to the present invention includes an image display procedure for displaying an image of a subject detected by a sensor on a screen, a measurement procedure for measuring a distance between any two points existing on the image, and the measurement procedure. Set in the measurement value display procedure for displaying the measurement value measured in step 1, the positional relationship setting procedure for setting the positional relationship among the subject, the sensor and the radiation source when photographing the subject, and the positional relationship setting procedure. A shooting environment display procedure for displaying a shooting environment including a positional relationship, and a ratio between an actual size of the subject detected in the image detected by the sensor and the measured value is calculated using the positional relationship set in the positional relationship setting procedure. And a ratio display procedure for displaying the ratio calculated in the ratio calculation procedure.

  According to the present invention, since the ratio is displayed together with the measurement value, the actual dimension of the measurement site in the subject can be easily obtained. Furthermore, if the imaging environment is displayed on the screen, the positional relationship among the subject, sensor, and radiation source can be set intuitively using a mouse or the like on the GUI.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a hardware configuration of an X-ray image display apparatus according to the first embodiment of the present invention.

  As shown in FIG. 1, in this embodiment, an input device 101 such as a mouse and a keyboard from which an operator inputs an instruction from the outside, a CPU that decodes the instruction input from the input device 101 and performs overall control, etc. Control device 102, a data storage device 103 for storing data such as a hard disk and an external storage medium, and a display device 104 such as a CRT and a liquid crystal display for displaying information and images, etc., are connected to each other. ing. The control device 102 performs control based on a program stored in a ROM (not shown) or the like.

  Next, the functional configuration of the first embodiment will be described. FIG. 2 is a functional block diagram showing a functional configuration of the X-ray image display apparatus according to the first embodiment of the present invention.

  In the present embodiment, an instruction unit 201, an image storage unit 202, an image reception unit 203, an image display unit 204, a measurement processing unit 205, a measurement value display unit 206, a shooting environment setting unit 207, a shooting environment display unit 208, an enlargement ratio A / reduction rate calculation unit 209 and an enlargement rate / reduction rate display unit 210 are provided.

  The instruction unit 201 corresponds to, for example, the input device 101 and gives various instructions to the X-ray image display device. The image storage unit 202 corresponds to, for example, the data storage device 103 and stores image data obtained by X-ray imaging. The image receiving unit 203 includes, for example, the control device 102 and a program executed by the control device 102 and acquires image data stored in the image storage unit 202. The image display unit 204 includes, for example, the display device 104, the control device 102, and the like, and displays the image data acquired by the image reception unit 203.

  The measurement processing unit 205 includes, for example, the control device 102 and measures the length between two points in the image displayed on the image display unit 204 based on an instruction input from the input unit 101. The measurement value display unit 206 includes, for example, the display device 104, the control device 102, and the like, and displays measurement values obtained by measurement by the measurement processing unit 205.

  The imaging environment setting unit 207 includes, for example, the control device 102 and the like, and based on instructions input from the input unit 101 such as a mouse and a keyboard, the distance between the tube and the subject, the distance between the subject and the sensor, and the like. Set the shooting environment. The shooting environment display unit 208 includes, for example, the display device 104 and the control device 102, and displays the shooting environment set by the shooting environment setting unit 207. Accordingly, when the operator operates the input unit 101 while visually recognizing the shooting environment displayed on the shooting environment display unit 208, the shooting environment setting unit 207 sets a new shooting environment along with this operation. This setting result is displayed on the photographing environment display unit 208 as needed. Therefore, the operator can select a desired shooting environment while checking the contents displayed on the shooting environment display unit 208. Here, the imaging environment means a positional relationship between an X-ray source at the time of X-ray imaging of a subject, a subject and a sensor that receives X-rays, and a posture and orientation of the subject at the time of imaging.

  The enlargement ratio / reduction ratio calculation unit 209 is configured by, for example, the control device 102 and the like, and calculates the enlargement ratio or reduction ratio of the image based on the contents set by the shooting environment setting unit 207. The enlargement rate / reduction rate display unit 210 includes, for example, the display device 104 and the control device 102 party, and displays the value calculated by the enlargement rate / reduction rate calculation unit 209.

  FIG. 9 is a schematic diagram showing an example of display in a conventional X-ray image display device. As shown in FIG. 9, in the conventional X-ray image display device, an X-ray image 701 to be diagnosed by a diagnostician is displayed on the display, and an instruction to perform a predetermined operation on the X-ray image 701 is given. Various tool buttons are displayed as a GUI (graphical user interface). For example, when an operator clicks a button for performing a measurement process using a pointing device such as a mouse, the measurement process can be executed. As such a button, a measurement tool 702 is displayed in the example shown in FIG.

  When the operator instructs the X-ray image display apparatus to perform measurement processing by clicking the measurement tool 702 or the like, any two points on the X-ray image can be designated. In this state, when two points arbitrarily selected by the operator are designated, the X-ray image display device measures the distance between the two points, and further connects the designated two points with a line segment 703 to obtain the measured value. It is displayed in the measurement value display frame 704.

  In the example shown in FIG. 9, it is shown that the chest length measurement value measured by the operator is 250 mm, but this numerical value is the length in the mapping on the sensor, not the actual length. As described above, in the conventional X-ray image display device, only the length in the mapping on the sensor is displayed, and the exact length in the subject (actually measured value of human body tissue) cannot be obtained.

  In contrast to such a conventional X-ray image display device, in the present embodiment, not only the length of the mapping on the sensor, but also the ratio between the mapping length and the actual length is displayed, and another window representing the imaging environment Is displayed. FIG. 3 is a schematic diagram showing an example of display in the first embodiment of the present invention. As shown in FIG. 3, in the X-ray image display apparatus according to this embodiment, the image display unit 204 displays the X-ray image 301, and the measurement value display unit 206 displays a line segment 303 and a measurement value display frame 304. The shooting environment display unit 208 displays a shooting environment window 305. In the measurement value display frame 304, not only the measurement value display unit 206 displays the measurement value, but also the enlargement / reduction rate display unit 210 displays the ratio between the length of the mapping on the sensor and the actual length. In the shooting environment window 305, the shooting environment display unit 208 displays a shooting environment such as a positional relationship such as a tube, a subject, and a sensor. Further, like the conventional X-ray image display device, the measurement tool 302 is displayed as a GUI. Further, although not shown, it is preferable that a button for instructing processing generally performed on an X-ray image such as enlargement / reduction, contrast adjustment, and frequency enhancement is displayed as a GUI.

  Note that the shooting environment window 305 may be displayed in a window displaying an image in addition to being displayed as a pop-up window on the screen. Also, a plurality of X-ray images 301 that are diagnosed by the diagnostician may be displayed on the screen.

  Next, the contents of the shooting environment window 305 will be described. FIG. 4A is a diagram showing the configuration of the shooting environment window 305. In the imaging environment window 305, as shown in FIG. 4A, for example, a sensor 401 that receives X-rays, a subject 402, a tube (X-ray generation source) 406, a distance 403 between the sensor 401 and the subject 402, The object thickness 404 representing the thickness, the distance 405 between the sensor 401 and the tube 406, the length 407 measured by mapping on the sensor 401, the measurement part 408 to be actually measured, the distance 409 between the sensor 401 and the measurement part 408 The distance 410 between the measurement site 408 and the tube 406 and the imaging posture display unit 411 are displayed. The shooting posture display unit 411 displays, for example, the posture of the subject 402 at the time of shooting and from which direction of the sensor 401 the shooting environment window 305 is displayed (display direction of the shooting environment). That is, “standing position” in FIG. 4A indicates that shooting was performed with the subject 402 standing, and “upper” indicates that a straight line connecting the sensor 401 and the tube 406 is viewed from above the sensor 401. It shows that the shooting environment is displayed.

4B is a diagram showing a shooting environment window for a certain shooting environment, and FIG. 4C is a diagram showing a shooting environment window for a shooting environment different from the shooting environment shown in FIG. 4B. In the shooting environment shown in FIG. 4B and the shooting environment shown in FIG. 4C,
(1) Subject thickness 404 (404B, 404C),
(2) The distance 405 (405B, 405C) between the sensor 401 and the tube 406,
(3) Distance 409 (409B, 409C) between sensor 401 and measurement site 408 (408B, 408C), and (4) Distance 410 (410B, 410C) between measurement site 408 and tube 406
Is different. On the other hand, the lengths 407 (407B and 407C) in the mapping coincide with each other. This is because the imaging environment setting unit 207 has a function of expanding and contracting the width of the measurement site so that the length 407 in the mapping becomes constant based on the instruction input from the instruction unit 201. This is because the imaging environment setting unit 207 adjusts the width of the measurement site depending on the function.

  For example, when the measurement region 408B is moved to the sensor 401 side with respect to the imaging environment illustrated in FIG. 4B, the imaging environment setting unit 207 enlarges the length of the measurement region 408B and moves the measurement region 408B to the tube 406 side. Reduce the length of 408B. That is, there are two intersections between the sensor 401 and a straight line passing from the tube 406 through the end point of the measurement site 408B, and the imaging environment setting unit 207 determines the length of the line connecting the two points (length 407B in the mapping). ) Is expanded and contracted so that) is always constant. Such control is also performed for the shooting environment shown in FIG. 4C.

  It is possible to move the measurement site 408 to an arbitrary place, but it is also possible to provide a restriction that allows movement only inside the subject 402. In other words, by allowing the movement only within the range of the distance specified by the subject thickness 404, the outside of the subject 402 can be prevented from being set.

  In addition, various distances (numerical values) displayed in the shooting environment window 305 can be changed not only by changing the position of the sensor 401 by a mouse drag operation or the like, but the displayed numerical values can be directly changed using a keyboard or the like. It can be changed by editing. Similarly, the position of the measurement site 408 (408B, 408C) can also be moved by a mouse drag operation or the like.

  In addition to the “standing position” and “up” shown in FIG. 4A to FIG. 4C, for example, “posture” is displayed as the shooting posture, and “down”, “ “Left” or “Right” may be displayed. As described above, the display direction indicates from which direction of the sensor 401 the photographing environment is displayed when the straight line connecting the sensor 401 and the tube 406 is viewed. That is, the display direction indicates a direction based on a direction defined with respect to the sensor 401 (in this embodiment, the vertical direction and the horizontal direction from the sensor 401 toward the tube 406). Therefore, for example, as shown in FIG. 4D, when X-ray imaging is performed in the supine position and the display direction is on the right side when viewed from the reference direction of the sensor 401, that is, when the sensor 401 is viewed from the right side. Is displayed on the photographing posture display section 411D as “posture-right”.

  Note that the shooting posture can be acquired as supplementary information of the image to be displayed, and may be determined when the image to be displayed is determined, or the operator can manually select the shooting posture. Also, in FIGS. 4A to 4D, if the display direction of the shooting environment is specified as one of the top, bottom, left, and right directions with reference to the direction specified for the sensor 401, the display direction can be specified. Any standard may be used.

  Next, the ratio between the length in the mapping on the sensor and the actual length in the subject will be described. Here, an enlargement ratio and a reduction ratio will be described as examples of this ratio.

  The enlargement ratio is a value indicating how much the length 407 in the mapping on the sensor is an enlargement of the length on the actual measurement site 408. On the other hand, the reduction ratio is a value indicating how much the length on the measurement site 408 is reduced from the length 407 in the mapping on the sensor. Therefore, in the example shown in FIG. 4B, since the distance 409B between the sensor and the measurement site is 30 cm and the distance 410B between the tube and the measurement site is 102 cm, the enlargement rate and reduction rate are expressed by Equation 1 and Equation 2, respectively. expressed.

  In the example shown in FIG. 4C, since the distance 409C between the sensor and the measurement site is 8 cm and the distance 410C between the tube and the measurement site is 134 cm, the enlargement rate and reduction rate are expressed by Equation 3 and Equation 4, respectively. expressed.

  These are examples of the method for obtaining the ratio, and the method for obtaining the ratio between the length of the mapping on the sensor and the length of the measurement site in the subject is not limited to these.

  Next, the operation of the X-ray image display apparatus according to the first embodiment will be described. FIG. 5 is a flowchart showing the operation of the X-ray image display apparatus according to the first embodiment of the present invention. FIG. 5 shows a flow relating to display of an enlargement ratio or reduction ratio when a measurement operation is performed on an image, and other operations on the image are omitted.

  First, in step S501, when the operator inputs a patient ID or patient information is input from the instruction unit 201 using a card reader or the like, the image receiving unit 203 outputs image data based on the input patient information. The image is read from the storage unit 202, and the image display unit 204 displays the corresponding patient image based on the image data.

  In step S502, when an operator inputs a measurement processing instruction from the instruction unit 201 by selecting a measurement tool displayed on the screen and selecting a measurement part (two points), the measurement processing unit 205 Starts the measurement process.

  Thereafter, in step S503, the measurement value display unit 206 displays the value measured by the measurement processing unit 205.

  Further, based on the shooting environment set in advance by the shooting environment setting unit 207, the enlargement ratio / reduction ratio calculation unit 209 calculates the enlargement ratio or reduction ratio, and the enlargement ratio / reduction ratio display unit 210 performs the step. Displayed in S504. Also, the shooting environment display unit 208 displays the shooting environment in the shooting environment window 305 in step S505.

  Thereafter, in step S506, it is determined whether or not there is an instruction to change the shooting environment from the operator. If there is such an instruction, in step S507, the position of the sensor, subject, tube, etc. on the screen and display are displayed to the operator. A new imaging environment is set by requesting a change in various parameters such as direction.

  In step S508, the enlargement ratio / reduction ratio calculator 209 calculates the enlargement ratio or reduction ratio based on the various parameters changed in step S507. Subsequently, in step S504, the enlargement ratio / reduction ratio display unit 210 displays the value calculated in step 508 after erasing the enlargement ratio or reduction ratio displayed so far.

  In step S505, the shooting environment to be displayed first is displayed with a specified value (initial value), and is set in advance. If there is no need to change the displayed shooting environment (in the case of No in step S506), the measurement operation is terminated in order to proceed to another operation as it is.

  According to the first embodiment as described above, not only the measurement value but also the enlargement ratio or reduction ratio is displayed as a ratio in the measurement value display frame 304, so that the actual dimension between two points in the observation point 408 can be obtained. Can be easily obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. When the measurement site is tilted in the X-ray image 301, the length of the measurement site 408 displayed in the imaging environment window 305 may become extremely short depending on the tilt angle and the display direction. In such a case, it may be difficult to change the shooting environment. The second embodiment has a function of preventing difficulty in performing such an operation. FIG. 6 is a diagram showing functions and operations of the X-ray image display apparatus according to the second embodiment of the present invention.

  For example, in the present embodiment, when two points are specified in performing the measurement process, an angle formed by a line segment connecting the two specified points and the vertical direction is obtained, and as shown in FIG. When the angle θ formed by the line segment connecting the two points and the vertical direction is less than 45 degrees, the display direction of the photographing environment is set to “right” or “left”.

  By providing such a function, it is possible to suppress the length of the measurement site 408 from becoming extremely short, and it is possible to always keep a change operation easily.

  In this embodiment, the threshold value of the angle formed by the line connecting the two points and the vertical direction is 45 degrees, but the angle formed by any other direction and any angle may be used as the threshold value. In addition, the display direction may be changed when the angle formed by the line segment connecting the two points and the predetermined direction exceeds a threshold value.

  Also in the first embodiment, the operator can manually change the display direction. However, in the second embodiment, since the change is automatically performed, the operation is performed more than in the first embodiment. It can be said that the nature is high.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first and second embodiments, only the case where the measurement site is parallel to the surface of the sensor is assumed. However, the actual measurement site may be inclined with respect to the sensor surface. However, in the first and second embodiments, the length or ratio in this case cannot be measured. Even in such a case, the third embodiment has a function of obtaining a ratio between the length of the mapping on the sensor and the actual length of the measurement site. FIG. 7 is a diagram showing functions and operations of the X-ray image display apparatus according to the third embodiment of the present invention.

  In the third embodiment, when two points are specified in performing the measurement process, the two specified points on the imaging environment window 305 or the X-ray image 301 displayed on the image display unit 204 are displayed. The xy coordinates (x1, y1) and (x2, y2) are obtained. The position of the origin at this time is not particularly limited. The enlargement ratio and the reduction ratio are expressed by Expression 5 and Expression 6 using the distance D on the sensor, respectively.

  However, the enlargement rate and reduction rate are those when the line segment 303 is horizontal on the X-ray image as in the first embodiment, and the line rate is the same as in the second embodiment. When the minute 303 is inclined, it is necessary to consider the z coordinate in the z-axis direction perpendicular to the xy plane.

  Further, instead of displaying the distance D and the enlargement ratio or the reduction ratio in the measurement value display frame 304, a value given by Equation 7 may be displayed as the actual length of the measurement site.

  In this way, in order to make it possible to move the measurement region 408 obliquely with respect to the depth direction of the subject 402, for example, the end point of the measurement region 408 can be dragged with a mouse or the like. Just create a program. At this time, the end point of the measurement site 408 is preferably moved so that the length 407 in the mapping on the sensor is always constant, as shown in FIG.

  According to such a third embodiment, the distance between two points having different depths in the subject 402 can also be obtained accurately and easily.

  The embodiment of the present invention can be realized by, for example, a computer executing a program. Also, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium such as the Internet for transmitting such a program is also applied as an embodiment of the present invention. Can do. The above program can also be applied as an embodiment of the present invention. The above program, recording medium, transmission medium, and program product are included in the scope of the present invention.

1 is a block diagram showing a hardware configuration of an X-ray image display apparatus according to a first embodiment of the present invention. It is a functional block diagram which shows the function structure of the X-ray image display apparatus which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows an example of the display in the 1st Embodiment of this invention. 6 is a diagram showing a configuration of a shooting environment window 305. FIG. It is a figure which shows the imaging environment window with respect to a certain imaging environment. FIG. 4B is a diagram showing a shooting environment window for a shooting environment different from the shooting environment shown in FIG. 4B. It is a figure which shows the example of the display direction displayed on the imaging | photography attitude | position display part. It is a flowchart which shows operation | movement of the X-ray image display apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the function and operation | movement of an X-ray image display apparatus which concern on the 2nd Embodiment of this invention. It is a figure which shows the function and operation | movement of an X-ray image display apparatus which concern on the 3rd Embodiment of this invention. It is a figure which shows the movement aspect of the measurement site | part 408 in 3rd Embodiment. It is a schematic diagram which shows an example of the display in the conventional X-ray image display apparatus.

Explanation of symbols

101: Input device 102: Control device 103: Data storage device 104: Display device 201: Instruction unit 202: Image storage unit 203: Image reception unit 204: Image display unit 205: Measurement processing unit 206: Measurement value display unit 207: Shooting Environment setting section 208: Shooting environment display section 209: Enlargement ratio / reduction ratio calculation section 210: Enlargement ratio / reduction ratio display section

Claims (17)

Image display means for displaying an image of a subject detected by the sensor on a screen;
Measuring means for measuring the distance between any two points present on the image;
A measurement value display means for displaying the measurement value measured by the measurement means;
A ratio calculating means for calculating a ratio between an actual size of the image detected by the sensor and the measured value;
Ratio display means for displaying the ratio calculated by the ratio calculation means;
A positional relationship setting means for setting a mutual positional relationship between the subject, the sensor and the radiation source when photographing the subject;
Photographing environment display means for displaying a photographing environment including the positional relation set by the positional relation setting means;
Have
The image display device characterized in that the ratio calculation means calculates the ratio using the positional relationship set by the positional relationship setting means. The ratio calculating means calculates, as the ratio, an enlargement ratio indicating how much the measured value is an enlargement of the actual dimension,
The image display apparatus according to claim 1, wherein the ratio display unit displays the enlargement ratio. The ratio calculating means calculates, as the ratio, a reduction ratio indicating how much the actual dimension is a reduction of the measured value,
The image display apparatus according to claim 1, wherein the ratio display unit displays the reduction ratio.   The imaging environment display means schematically displays the subject, the sensor, and the radiation source on an arbitrary screen based on their positional relationship, and displays the schematic display from any direction. 4. The image display device according to claim 1, wherein a display direction indicating whether the image is present and a photographing posture of the subject are displayed. 5.   When the image displayed on the screen is an image of a plane parallel to the surface of the sensor, the positional relationship setting means can change at least the positions of the parallel plane, the sensor, and the radiation source. The image display device according to claim 1, wherein the image display device is configured as follows.   The positional relationship setting means, when the image displayed on the screen is an image of a surface inclined from the surface of the sensor, at least an end portion of a region corresponding to the image in the inclined surface, The image display device according to claim 1, wherein the position of the sensor and the radiation source can be changed.   The said positional relationship setting means is comprised so that the range which can be displayed on the said screen among the surfaces in the said to-be-photographed object is comprised, The structure of any one of Claim 1 thru | or 6 characterized by the above-mentioned. The image display device described.   8. The photographing environment display unit is configured to change a display mode of the photographing environment based on a direction in which a line segment connecting the two points extends. The image display device according to claim 1. A sensor,
A radiation source for generating radiation towards the sensor;
The image display device according to any one of claims 1 to 8,
An image display system comprising: An image display step for displaying an image of the subject detected by the sensor on the screen;
A measurement step of measuring a distance between any two points present on the image;
A measurement value display step for displaying the measurement value measured in the measurement step;
A positional relationship setting step for setting a mutual positional relationship between the subject, the sensor and the radiation source when photographing the subject;
A shooting environment display step for displaying a shooting environment including the positional relationship set in the positional relationship setting step;
A ratio calculating step of calculating a ratio between an actual size of the image detected by the sensor and the measured value using the positional relationship set in the positional relationship setting step;
A ratio display step for displaying the ratio calculated in the ratio calculation step;
An image display method characterized by comprising: On the computer,
An image display procedure for displaying an image of the subject detected by the sensor on the screen;
A measurement procedure for measuring the distance between any two points present on the image;
A measurement value display procedure for displaying the measurement value measured in the measurement procedure;
A positional relationship setting procedure for setting a mutual positional relationship between the subject, the sensor and the radiation source when photographing the subject;
A shooting environment display procedure for displaying a shooting environment including the positional relationship set in the positional relationship setting procedure;
A ratio calculation procedure for calculating a ratio between the actual size of the image detected by the sensor and the measured value using the positional relationship set in the positional relationship setting procedure;
A ratio display procedure for displaying the ratio calculated in the ratio calculation procedure;
A program for running An image display step for displaying an image of the photographed subject on the screen;
An imaging environment display step for displaying an imaging environment including the positional relationship between the subject, the imaging surface, and the radiation source when imaging the subject;
A positional relationship setting step for setting a mutual positional relationship between the subject, the imaging surface, and the radiation source when imaging the subject;
An image magnification calculating step for calculating a magnification of the subject image using the positional relationship set by the positional relationship setting step;
An image display method characterized by comprising:   13. The image display method according to claim 12, wherein in the photographing environment display step, information indicating a photographing posture of the subject is displayed.   The image display method according to claim 12 or 13, wherein in the imaging environment display step, information indicating from which direction the mutual positional relationship among the subject, the imaging surface, and the radiation source is expressed is displayed. .   15. The distance from the measurement target part of the subject to the radiation source and a distance from the measurement target part of the subject to the imaging plane are set in the positional relationship setting step. The image display method according to any one of the above items.   16. The image display method according to claim 15, wherein, in the positional relationship setting step, a distance from the imaging surface to the subject, a distance from the imaging surface to the radiation source, and the subject thickness are set. Image display means for displaying an image of the photographed subject on the screen;
An imaging environment display means for displaying an imaging environment including a positional relationship among the subject, the imaging surface, and the radiation source when imaging the subject;
A positional relationship setting means for setting a mutual positional relationship between the subject, the imaging surface, and the radiation source when imaging the subject;
An image display apparatus comprising: an image magnification calculation unit configured to calculate a magnification of the subject image using the positional relationship set by the positional relationship setting unit.

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